EFFECT OF TAPER WITH THREADED TOOL PROFILE ON MECHANICAL AND MICROSTRUCTURAL PROPERTIES OF FRICTION STIR WELDED 5083 ALUMINIUM ALLOY

A study was prepared of weldability of 4mm-thick aluminium alloy 5083 plates by friction stir welding. The arrangement of experiments was prepared based on ability of universal milling machine and where different tool rotations speeds 900r/min, 1120r/min, 1400r/min and 1800r/min, the welding speed is at 40mm/min were taken. Analysis is made with the threaded profile tool. Samples for microstructure analysis, Vickers micro-hardness measurements and tensile-testing samples were prepared. It was observed that the better mechanical properties were achieved at moderate tool rotational speed, and equi-axed grains obtained at threaded profile tool, grain size were obtained half of the base material.